Rubeus, also known as Crimson Rubeus (in Japanese: 紅のルベウスKurenai no Rubeusu), is the first member of the Black Moon Clan to appear in the 20th century. He is charged with finding a person codenamed "Rabbit", who had fled into the Tokyo of the past. Besides following the orders of Prince Demand and Wiseman, he leads his own set of minions, the Negamoon Sisters.